Linked Life Data

7600737

Source:http://linkedlifedata.com/resource/pubmed/id/7600737

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
1995-8-10
pubmed:abstractText
We tested the hypothesis that the whole body energy expenditure, plasma norepinephrine, cardiovascular, and internal body temperature adjustments to prolonged submaximal exercise (i.e., 'cardiovascular drift') performed at the same per cent of peak oxygen uptake (per cent VO2peak) under thermoneutral ambient conditions would be smaller in older compared to young non-physically trained men. Healthy young (25 +/- 1 years; VO2max = 49.3 +/- 1.6 ml kg-1 min-1; n = 6) and older (66 +/- 2 years; VO2max = 31.5 +/- 2.3 ml kg-1 min-1; n = 6) untrained men with similar levels of chronic physical activity were studied during pre-exercise standing rest and serially during 45 min of constant load treadmill walking at approximately 65% VO2peak (Ta = approximately 23 degrees C; approximately 40 RH). There were no group differences at rest. From rest to 5 min of exercise, the increases in heart rate were less (P < 0.05), the changes in arterial blood pressure and per cent delta blood volume were not different, and the rise in plasma norepinephrine concentration was greater (P < 0.05) in the older men vs. young controls. Consistent with our hypothesis, the increases in rectal temperature and plasma norepinephrine concentrations from 5 to 45 min of exercise were smaller in the older men (1.06-0.18 vs. 1.46 +/- 0.16 degrees C and 110 +/- 132 vs. 443 +/- 189%, respectively, P < 0.05). In contrast, the progressive increases in VO2, heart rate, and perceived effort, as well as the time-dependent reductions in systolic, mean and diastolic arterial blood pressure and per cent delta blood volume, were not different in the two groups. Thus, the whole body energy expenditure and selected cardiovascular adjustments to prolonged submaximal treadmill exercise performed at the same per cent VO2peak under comfortable ambient conditions are not different in healthy, physical activity-matched young and older men, despite a smaller elevation in internal body temperature in the latter.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Mar
pubmed:issn
0144-5979
pubmed:author
pubmed:issnType
Print
pubmed:volume
15
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
169-81
pubmed:dateRevised
2008-11-21
pubmed:meshHeading
pubmed:year
1995
pubmed:articleTitle
Cardiovascular, plasma norepinephrine, and thermal adjustments to prolonged exercise in young and older healthy humans.
pubmed:affiliation
Department of Kinesiology, University of Colorado, Boulder 80309, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.